Figure 6

Average APA duration for each sensor using the angular velocity in the vertical plane (AV-UD) to detect the end of the APA. The beginning of the APA was considered to be when the each signal was greater than 3 times the standard deviation of the baseline during the first 2000 ms of each signal, and the end was determined by the time when the signal went back to baseline level. All signals went through a LPF zero phase (Butterworth Fc = 3.5 Hz).